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Can I ask you something else?
For the correct operation of a video card with 256 megabytes of memory, via apollo pro 133A(T) requires no more than 2.5 gigabytes of RAM on the motherboard. Because otherwise, the artifacts begin. To operate a 128 megabyte video card, you can use all 3 gigabytes on the motherboard, there will be no artifacts. As I understand it, it turns out that the memory of the video card somehow climbs onto the registers of this third gigabyte, conditionally it turns out like this:
128MB Video
[--------1--------2--------3**------4]
256MB Video
[--------1--------2------**3**------4]
Therefore, when there are 3 gigabytes in the system, problems begin. If you make 2.5 gigabytes, then there are no problems.
Is it possible to reassign the memory somehow so that the address space is allocated FOR the 4th gigabyte? After all, does the bridge chip work as the BIOS tells to him?